Arcana likes to wear earthy tones but isn't against bright, positive colours like a sunny yellow or watery blue.
She prefers to have at least one article of clothing be baggy or partially open so as not to feel too constrained. She once wore tight pants and a tight long-sleeved top at the same time and felt the reduced blood flow gave her a headache. Never again.
Arcana's superiors have given her a pass when it comes to uniform convention, with the exception of her Yellowjacket department coat. She mostly works at a desk or in the chocobo stables so she's not expected to see any action. This is good because she finds metallic headgear to be the worst feeling in the entire world. She would probably have to go five sizes up to fit in her fluffy mane and floppy ears.